/**
* Calculate the rectangle that belongs to the given destination envelope in the given source
* image.
*/
private Object[] calcRegionRectangle(
Envelope dstenv, Envelope srcenv, double srcwidth, double srcheight) {
GeoTransform gt =
new WorldToScreenTransform(
srcenv.getMin().getX(),
srcenv.getMin().getY(),
srcenv.getMax().getX(),
srcenv.getMax().getY(),
0,
0,
srcwidth - 1,
srcheight - 1);
int minx = (int) Math.round(gt.getDestX(dstenv.getMin().getX()));
int miny = (int) Math.round(gt.getDestY(dstenv.getMax().getY()));
int maxx = (int) Math.round(gt.getDestX(dstenv.getMax().getX()));
int maxy = (int) Math.round(gt.getDestY(dstenv.getMin().getY()));
Rectangle rect = new Rectangle(minx, miny, maxx - minx + 1, maxy - miny + 1);
LonLatEnvelope lonLatEnvelope = calcLonLatEnvelope(dstenv, getNativeSRSCode());
return new Object[] {rect, dstenv, lonLatEnvelope};
}
/**
* renders one point to the submitted graphic context considering the also submitted projection
*
* @param g
* @param point
* @param projection
* @param image
* @param dis displacement
*/
private void drawPoint(
Graphics2D g, Point point, GeoTransform projection, Image image, double[] dis) {
Envelope destSize = projection.getDestRect();
Position source = point.getPosition();
int x = (int) Math.round(projection.getDestX(source.getX()) + 0.5 + dis[0]);
int y = (int) Math.round(projection.getDestY(source.getY()) + 0.5 + dis[1]);
int x_ = x - (image.getWidth(null) >> 1);
int y_ = y - (image.getHeight(null) >> 1);
int dx = Math.min(image.getWidth(null), (int) destSize.getWidth() - x_);
int dy = Math.min(image.getHeight(null), (int) destSize.getHeight() - y_);
int tx = Math.min((int) destSize.getWidth(), x_ + image.getWidth(null));
int ty = Math.min((int) destSize.getHeight(), y_ + image.getHeight(null));
g.drawImage(image, x_, y_, tx, ty, 0, 0, dx, dy, null);
}